LP5521TMEV National Semiconductor, LP5521TMEV Datasheet

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LP5521TMEV

Manufacturer Part Number
LP5521TMEV
Description
EVAL BOARD FOR LP5521
Manufacturer
National Semiconductor
Datasheets

Specifications of LP5521TMEV

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
Q5109809
© 2009 National Semiconductor Corporation
LP5521TM Evaluation Kit
General Description
The LP5521 is a three channel LED driver designed to pro-
duce variety of lighting effects for mobile devices. High effi-
ciency charge pump enables LED driving over full Li-Ion
battery voltage range. The device has a program memory for
creating variety of lighting sequences. When program mem-
ory has been loaded, LP5521 can operate independently
without processor control.
LP5521 maintains excellent efficiency over a wide operating
range by automatically selecting proper charge pump gain
based on LED forward voltage requirements. LP5521 is able
to automatically enter power-save mode, when LED outputs
are not active and thus lowering current consumption.
Three independent LED channels have accurate pro-
grammable current sources and PWM control. Each channel
has program memory for creating desired lighting sequences
with PWM control.
LP5521 has a flexible digital interface. Trigger I/O and 32 kHz
clock input allow synchronization between multiple devices.
Interrupt output can be used to notify processor, when LED
sequence has ended. LP5521 has four pin selectable I
dresses. This allows connecting up to four parallel devices in
one I
trol pin for other devices.
LP5521 requires only four small ceramic capacitors.
LP5521 is available in tiny 2.1x1.7x0.6 mm microSMD-20
package and in 4.0x5.0x0.8 mm bumped LLP-24 package.
2
C bus. GPO and INT pins can be used as a digital con-
300197
FIGURE 1. LP5521 Evaluation Board
2
C ad-
National Semiconductor
AN-1632
Tomi Koskela
January 16, 2009
Evaluation Kit Overview
LP5521 Evaluation Kit is based on computer controlled sys-
tem, where the actual LP5521 devices are controlled and
powered through USB interface. Also external power can be
used if wanted. Two different sets of LEDs can be selected,
either white LEDs or RGB LEDs. Four LP5521TM devices are
assembled on one board to be able to evaluate the triggering/
sequencing of multiple devices in one application.
The kit supports complete functional evaluation of the circuit.
The evaluation kit consists of:
LP5521 evaluation board
USB interface cable
CD—ROM including:
— Evaluation software
— Command compiler software
— Demo sequences
— LP5521 datasheet
— LP5521 power saving application note
— LP5521 programming application note
— Evaluation kit document (this doc.)
— MicroSMD-20 PCB layout guidelines
30019715
www.national.com

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LP5521TMEV Summary of contents

Page 1

... C bus. GPO and INT pins can be used as a digital con- trol pin for other devices. LP5521 requires only four small ceramic capacitors. LP5521 is available in tiny 2.1x1.7x0.6 mm microSMD-20 package and in 4.0x5.0x0.8 mm bumped LLP-24 package. © 2009 National Semiconductor Corporation National Semiconductor AN-1632 Tomi Koskela January 16, 2009 ...

Page 2

Evaluation Software, Full Access Two versions of the LP5521 evaluation software and some support files are supplied on the delivery CD together with all available documentation regarding the circuit. Full access software allows control of all of the LP5521 features, ...

Page 3

Step button program can be executed one command at a time. Evaluation Software, Easy Easy software (LP5521x4easy.exe) is intended for users needing control only for the basic features. With the General Control all LP5521 chips can be enabled at the ...

Page 4

Command Compiler Command compiler is used to write LED sequences for the LP5521. Command compiler is a simple to use Windows pro- gram with graphic user interface. User can write own memory files by using command compiler's editor or any ...

Page 5

Commands Ramp Ramp command generates a PWM ramp from current value. Ramp command has two parameters – first is time in mil- liseconds (floating point format, maximum execution time t = (1000 ms x number of steps ms) ...

Page 6

Evaluation Hardware The evaluation board has four LP5521 circuits with the nec- essary external components placed around them. Test points for the signals are on the board edges. INT and TRIG lines for the four chips are tied together to ...

Page 7

Getting Started 1. Connect the USB cable from the evaluation Kit to the USB port of your PC. When you plug in the USB cable for the first time, your operating system prompts you about “New hardware found” and installs ...

Page 8

FIGURE 6. LP5521 Evaluation Board Schematic 8 30019709 ...

Page 9

Evaluation Board Layout The evaluation board layers are: 1. Top, component side, signal 2. GND plane 3. Power plane 4. Bottom, solder side, signal FIGURE 7. LP5521 Evaluation Board Layer 1 (Top, Signal). FIGURE 8. LP5521 Evaluation Board Layer 2 ...

Page 10

List of Main Components Model C1005X5R1A105K Ceramic X5R ECJ0EB1A105M Ceramic X5R C1005X5R1A474K Ceramic X5R ECJ0EB0J474K Ceramic X5R LATB R98G RGB chip LED LW Q38G www.national.com Type Vendor Capacitor 1μF for C and C (two alternatives) OUT IN TDK Panasonic Capacitor ...

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11 www.national.com ...

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... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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